ALMACAL XIII. Evolution of the CO luminosity function and the molecular gas mass density out to z ∼ 6

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646356" target="_blank" >RIV/67985815:90106/25:00646356 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1051/0004-6361/202453223" target="_blank" >https://doi.org/10.1051/0004-6361/202453223</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202453223" target="_blank" >10.1051/0004-6361/202453223</a>

Result language

angličtina

Original language name

ALMACAL XIII. Evolution of the CO luminosity function and the molecular gas mass density out to z ∼ 6

Original language description

Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential for understanding galaxy evolution. ALMA has made significant progress in the study of the cosmic evolution of cold molecular gas. Here, we exploit the ALMACAL survey to address issues relating to small sample sizes and cosmic variance, utilising calibration data from ALMA to compile a statistically significant and essentially unbiased sample of CO-selected galaxies. By employing a novel statistical approach to emission-line classification using semi-analytical models, we place strong constraints on the CO luminosity function and the cosmic evolution of molecular gas mass density (rho H2) back to z similar to 6. The cosmic molecular gas mass density increases with redshift, peaking around z similar to 1.5, then slowly declines towards higher redshifts by similar to 1 dex. Our findings confirm the key role of molecular gas in fuelling star formation. The new rho H-2 estimates allow us to revisit the cosmic baryon cycle, showing that the ratio of molecular gas-to-stellar mass density is consistent with the so-called bathtub model of baryons, which implies a continuous replenishment of gas. The cosmic gas depletion timescale, estimated on a global scale, is shown to be fairly constant at all redshifts. We emphasise the importance of surveys using multiple small fields rather than a single contiguous area to mitigate the effects of cosmic variance.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

—

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

695

Issue of the periodical within the volume

March

Country of publishing house

FR - FRANCE

Number of pages

21

Pages from-to

A163

UT code for WoS article

001447116500028

EID of the result in the Scopus database

2-s2.0-105000392104